Abstract:In a rece nt paper (publis hed in Nachr. T echn. Zeitschr.) Volland proposes an a nalyti cal model of the earth· ionos phe re waveguid e which is claimed to be in basi c agreem e nt with th e predictions of t he se mi e mpirica l transmi ssion formula of L W. Au stin for frequ e ncies less than 300 kc/s. In this note, th e Rat·earth as s umption s mad e by Volland are que stion e d an d any agreement of hi s res u lt with Austin's formula is a ttribut ed to a fortuitou s can cell ation of e rrors.It is rathe r… Show more
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